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Many database-driven web applications need to identify users. For example,
you log in to access your Gmail account, or to use Amazon bookstore services.
TurboGears therefore provides an identity system that you can use in your
applications. This system supports both authentication (who is the user?) and
authorization (which rights does the user have?) features, and allows
role-based access control by assigning users to groups.

You use identity decorators to require user authentication and to authorize
specific accesses: